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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47f8c468f32f5115a8ac48997da5c3188e7a1c05e52eb97265ef485b0b9a360b' 
  AND token = 'chNBIP/6ae+1+Z+8IDM2ZQk0gP5d5cSB3D75K0dsrm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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