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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cf7a637068427bc8ad3596bf35022b130a1d11b504539fb2fe636f72a5b524a' 
  AND token = '1iij5baz58iweHeofPHrNgGcLV9sfXvy9oVVajc9N3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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