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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c51b9a271752c1dabe2372eccfe4f0e46d20a93baef8786e4009a656e9de8b88' 
  AND token = 'iFj+ArXJkRSysvDrAxlO6Pp3qFFh6Ny2IaKNxpFKjxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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