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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe0117025be432b47d347e5181d3a6fe894307e7ecf773a5f7df48de4137a888' 
  AND token = 'SkE4H8TNEfDnmOxRDxAnvigLst4adnyFGK9MTnB38TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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