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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8aee9fc3817720a40d0c459618c3d93de9baac06d854223e35ec6f7f2ca1dcf8' 
  AND token = 'bsoRruC7cm3VdXzowOjEMfRt2JpNWs8bLa5p9Xax4z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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