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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1db7a6ba66c984076559508f0911286511b52353fbdafd16570ebb677cb6b91' 
  AND token = 'gT/pilYkjpYAS3GlerSn7AZE8GbwB6F5HlkY5xaSB0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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