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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1a0931d509eca2e4bca93103c74805a99348d4a4e3a48a5b868486d79da7da8' 
  AND token = 'bT0EqEL3E/Lg6GJRFjTtxZOP3Trb8LLVHSUBx0puOlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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