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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6468b8092ec14d4f8a409225936c4929273d60f7c30c6a5306251d02336c757' 
  AND token = 'TGqvgXm6EsYLDKi2IypeI6rxcJztIDrsA5xd0db/PeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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