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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c63f41acfdfda3e219bac181821e0054c58db59da01e99a89842deea8994710' 
  AND token = '/H/8iOhCCtmiEcLrbXW7c/LO1nYMm5bzlji51tDspso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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