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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0f4c55c5fe1625d70a634518cd507c927cee2f8f4d6adacb21b3ba1929036fb' 
  AND token = 'uLAxKGpfWDaQQIir1i9dJpbxmCmPETo62Yjq8errByo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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