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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d9336e4bd2ff5f7c4541fa4753c4bff5d85f194be179be18c8af431bacdee1e' 
  AND token = 'tr/Kh7MaZImsUXQhVdvBlbO+Zm3WsjB0Lr8ob8Z3vCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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