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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77d5bca7a22785f79678c78f8e0978441e2123db2f1ef10a48499bf1580f90cf' 
  AND token = '3pB+EkoKPpPZYGKHcaWUm7yY0GMPWeJ7IN0hZDTu1pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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