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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90fdb4c29ef637386ad34caf332fe7b4712b90371d73ae422ba3b6589f42cf3f' 
  AND token = 'SVZ+oi7eSpCh1E7MMBeIJP2EWDdDv8wZ/j9TuMi2HWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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