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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4880a912a16045164bd6c21f6d68b8d2296dacb7df03a0d440bbeaa73c08a24' 
  AND token = 'GRCDeSe2NUnXIrE2FIse/x7tdWl5KvPtqR5R95PLI/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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