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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13e09fcae8b0a1f4cc20e997bf03418584818bc646a02f4a139028463d5c8f7c' 
  AND token = '5BZYyrRN2BFDFN2zQRjuFm/oQLa914U6/z60McmkJR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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