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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9622f41f68de001db9b8df57a1c14a923918a57b44787c288f601b2290e8664b' 
  AND token = 'lp3bn1mNH8dvDqLdKvor4CeFgRYv8NC3oXkfODSAqfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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