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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8ed8d6b16d0cc4bc52e2ac2f07ad7aea0b38d11f121b91491a21cc2fae09d4a' 
  AND token = 'E6Ch5RW9O3Qlz24dCUI8SkZJ7NnDL2SyM6CUgkwMuVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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