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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbb45193f8ab6a73f9ecd2574614b419129660045357751e1449b11f2ec492b2' 
  AND token = 'CYB/Q/zad7EGIehV+PTbMasbfabjp/y1DxOhFlWljyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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