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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee4479ba86f9ad6d3778fd5e0035ef79fc8a7e7d289cde9d57d293a23acd14b5' 
  AND token = '6AgaUdxBjMg1Ho7/Us3Fs1jhxpAQ5k5P+DzOVzmNSAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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