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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d0bc88af3e3012e15423914e5124253e1d0d3b996196f3a21c9f119822b6c81' 
  AND token = 'TuP1sg829lVQKqbZzndQvqasrc8XIq6H6CqF9CnyK08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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