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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7296c800971d7122a6b295a67d076aef9cd9612826eeb10e5fee1a3ccb1d7c0c' 
  AND token = 'Fdg6tE1OrPrdu/kcX5EnG7ztBhEfCQvMZWev8SFL0TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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