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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e981a3a84a951de6a609437eec526134d894682a943871a86816818262e08d77' 
  AND token = '4GIb+F3TPLN2/XIHEEia1CIS319PC/LwaZvuOP12dFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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