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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '073f27abd3d8518f6193163e79373303d073334322d1d95b400b311cbf95a517' 
  AND token = 'i4DUBmROI2JTLS+DZ5QzaG+09H7i3ObnYsnhwwH5LAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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