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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a75147c088c94c0f56be16bdfebef8ab527fc6ea2905d7a9905c5c02d15b14af' 
  AND token = 'UfkjHasL7kITuNpBUyU8cjaR2cZU/fY3mlcsDjJLKcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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