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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b85c11e354ca6c1de99ea16301cccfc311d2231bb434d03fc8e286d7fab1d78e' 
  AND token = 'm/m3SYbgmUY08otjliz8zlBkj30QrNj8ONeWuEVrkAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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