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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8627aa3a5271c30872d7b7091e5c5923ea07cacb6e4470dc62e3c1ee1e8634bc' 
  AND token = 'HjNwlUWYNSwqHw91FdPvoT37cycQ2ZVAJKcsUlmoR1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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