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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0aa60746c59141ffa4049143fb6671de0087af10909ebb79a1f5bea170fc3d76' 
  AND token = '/pYsLiOlGpIhvRJasu1V1gn+M8q1PUQ9Ud7Nsz8oA2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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