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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a26810a12192fe39a71e40809f9b4be994eed62a7d60f99f3af39030c80ce65f' 
  AND token = 'beP+2QKmKGI2jDcCharMfbjfa91s54OXBEDMzsvGIVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}