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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5ff8965a78559ba57e64740fc43555c2f278d290abf35c41a39200ff9ed01de' 
  AND token = 'V5oyBuR3qeczuQlCEl1q8Fr2KVPcucOsf77vm8q2Kr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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