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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7e35b8213f60c1e575397f0c5f3499a780d712795ee7aeb138013ad2005d174' 
  AND token = 'PNT2qWBIiTFoh+gdG9usApfqIU5+fcUKsrVdEckC/is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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