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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c59f1a4a5c55242649dda007bab5f2bc27f7ec758f09923d12c64c8b1359bca1' 
  AND token = '8f7Am1FEeA0TYGkRIFfFbk4NE1v+h/FbJAmDy08di/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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