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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e129df3ad0bfaa698755a9794fe1f7f8c028b7d0942b15a55319939c1c091cae' 
  AND token = 'kcMmdOczfEKJdY8+15h0wBgPhCe15k6syWWc0A8ohGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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