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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2e23122f1c9301c1393ae7e3fa08c2315de6c579da755fc65351aedfdc93c62' 
  AND token = 'buiTCJUAe9utBzO0DsHlMP8/HZwYdZwcsv0W7jOWBlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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