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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c025a55f2e8939782ba6f619f003e660a87ce44dc39130eeda5c11f5a812a111' 
  AND token = '97rwqqDdYlPjUweNfVkM8+xHrZCG4PlB4udyPNLeU8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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