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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d3e2a1ae359f34d3973c06be360f6421bc0a6a882c1f71b72d43fde44535712' 
  AND token = 'enOfkVbIbmUqCTKa49O7UVC3uJWBECknsGTJ7ka9hUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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