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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91d2e206c9edd9d3c06ede7a5b6b87c0a41f2fa415242b0e2375847696dd3be7' 
  AND token = 'GTyS2xgrR7jdnVKnMmTDb66Rv01/Yo/4FOsN5zFu1FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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