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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7330dd1bb7ec49a58d5f168b1e15a7de5033e49fdaac74a16616753391c5e27a' 
  AND token = '11n7ezFf19LtxKWozFYCrMmZNOEP2mk6t7bTtsj/xJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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