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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a374b1948bd9e66998d9a629e4619a85315eee1f76451d19ed02ac2eaefa090' 
  AND token = 'zEwB7BGRds7PLhzCzfOCkmIdktW5h7uEbuoNNPr8QVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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