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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d3f96e4d9cef1f3af61ec2ef5c2339ad2630c09cf97d7ffa88ca14c6de98744' 
  AND token = 'IjZA2MJPFKXbtCkG/lUqd4aIvA9VCwHayuGVXtaAfks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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