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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3679714fc5006dd1e897ec8fd6bce26f9ac0c39fe9ebf9b10dd0b6bb74c8679' 
  AND token = 'D9JWTT+E+Xngo+n+G02d22db4PLOT++Hz9HvsHhdoSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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