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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dec27aa3b25d04d41a7230580747e6fec1c3199e7345a0276154925e7c025bdd' 
  AND token = 'Iw9w6lDA1VSyyehs5jv87Rn7vN3WcFvKwlTdPY02+4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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