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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f4c5cbb20c22e4bce8e8fc12b7b33551022094fb2d55d879c001836c5b6eb32' 
  AND token = 'lvRlOKAqbfxzBV8xM3MI4ij4Tf7EiQ3Ti9+nLmBYcu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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