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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc7423f80db93795a650611eb3b803a0599588fc3843d7a15af9b03dfe5accc7' 
  AND token = '1Bi1X0UmzUwq56KJ0LXkebQzwDPLlrWNWSZXhKX1A5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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