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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5cece8cb9d95820fc8fae17a78e56e8c48f72e7a13389f64ac6c71b282ceb90' 
  AND token = 'EsrNH85/Jk3+ejKsopG+CACgkOzNoNV8Sf7QFId9AVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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