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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85da925d2802f8772f397e277dd8d82df0cf97fe718924dd799361d2a5708ff6' 
  AND token = 'YVbVY1clEnzwYrCiX6ksjIgIJmgcOAtuul5zosTEp2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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