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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67cd5aa01cf930bd16f1d8988a845f5655a76f16cbe647c7a2b8f5d75a1809fb' 
  AND token = 'h6qElalCqhhonaA6C//r6u5D2IIsqIX14LidbbzX6is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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