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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd0bf5c943891c6bfeb969f9cb6c6af2bb8fe2b2092b9daa22c75cc9b6a8eba2' 
  AND token = 'xOvCc2ia+GsLGxGw1XSULkkssyJManDBXX6W1Vd2gj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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