SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eff239d7c3ad4611494d8499d2bd6ba24053fc12e75f18c93783117bc7b3e8ed' 
  AND token = 'PzGNvgQOy8CW/slx4doLT2oFUonieu7+CBNZbbkmPHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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