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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25d1ac9df433f46d3a3dd0c4c05cf897a1f8b00dddfa825744008257d6ef3d25' 
  AND token = '4vjHae5NYbtuOU2GlcRmPf99dTwxe2PvFKOcXeykd7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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