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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75fe212e078cd56d56e89ef29a55d6f868fbc0c88b67e1804583f87e1c2bc25e' 
  AND token = '4m2ws9HaKOexBIA0LztWU2vps//exyJGqDl8rsSPskg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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