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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c82df38b1c5ecda2d065950126e739972c2d02befc493b1444da534d2e4305e6' 
  AND token = 'BjEVw5Halut2uBCLM2JmFnCNlBZJRXW9ASXcxtJ5SaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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