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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba11d4a7ba76dfdbcd59b3f2d026c1105033eb92b24d1f656a27f925fcb32fa0' 
  AND token = 'RsY7IoU4D4QiV80HL1ZDL7s47pAn70M54IDUfc4PBgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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