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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dac0d32ba94e670f9e604c6d358ca848b8fa4c984b974ad6d40ea8ad8fc4f4ab' 
  AND token = '6x9oUtDEOcEyK/aNIrpDDwsnPK/Drn8m7m06rqkcSx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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