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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee9a4de86f5357cffdb21231c1867732ba3e3d33ee21f5e0ee14696865b650b5' 
  AND token = 'gt7jYC4Nd8aEqclb21aJE791DSQJarjwKnEATZEKmGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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